Compared to WordPress, which touts backward compatibility as a strength, yet still manages to break itself in some way, shape, or form with every new release?
I'm not necessarily comparing to WordPress. What I'm saying is that they should be going in the other direction; towards better backwards compatibility.
Of course, one way to achieve this is less reliance on add-ons, so you have less API surface to expose. Having a usable WordPress install relies so heavily on add-ons that it's kind of pointless to consider WordPress alone.
